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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss), Net
Retained Earnings (Deficit)
Beginning Balance (in shares) at Dec. 31, 2013   80,583      
Beginning Balance at Dec. 31, 2013 $ 633,970 $ 8 $ 729,578 $ 294 $ (95,910)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 145,832       145,832
Net change in unrealized gains (losses) from investments (238)     (238)  
Net change in foreign currency translation adjustment (196)     (196)  
Issuance of common stock relating to employee equity compensation plans (in shares)   1,536      
Issuance of common stock relating to employee equity compensation plans 18,028 $ 0 18,028    
Tax withholdings related to net share settlement of restricted stock units (7,608)   (7,608)    
Common stock repurchased and retired (shares)   (1,914)      
Common stock repurchased and retired (98,233)   (17,804)   (80,429)
Net tax benefits from stock-based awards 21,393   21,393    
Stock-based compensation 39,823   39,823    
Ending Balance (in shares) at Dec. 31, 2014   80,205      
Ending Balance at Dec. 31, 2014 752,771 $ 8 783,410 (140) (30,507)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 144,020       144,020
Net change in unrealized gains (losses) from investments (686)     (686)  
Net change in foreign currency translation adjustment (164)   (10) (154)  
Issuance of common stock relating to employee equity compensation plans (in shares)   991      
Issuance of common stock relating to employee equity compensation plans 11,325 $ 0 11,325    
Tax withholdings related to net share settlement of restricted stock units (20,716)   (20,716)    
Common stock repurchased and retired (shares)   (1,696)      
Common stock repurchased and retired (101,791)   (15,669)   (86,122)
Net tax benefits from stock-based awards 10,224   10,224    
Stock-based compensation 52,943   52,943    
Ending Balance (in shares) at Dec. 31, 2015   79,500      
Ending Balance at Dec. 31, 2015 847,926 $ 8 821,507 (980) 27,391
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 189,682       189,682
Net change in unrealized gains (losses) from investments 712     712  
Net change in foreign currency translation adjustment (670)     (670)  
Issuance of common stock relating to employee equity compensation plans (in shares)   1,163      
Issuance of common stock relating to employee equity compensation plans 13,778   13,778    
Tax withholdings related to net share settlement of restricted stock units (29,857)   (29,857)    
Common stock repurchased and retired (shares)   (1,110)      
Common stock repurchased and retired (96,218)   (10,593)   (85,625)
Net tax benefits from stock-based awards 15,888   15,888    
Stock-based compensation 54,148   54,148    
Ending Balance (in shares) at Dec. 31, 2016   79,553      
Ending Balance at Dec. 31, 2016 $ 995,389 $ 8 $ 864,871 $ (938) $ 131,448